Remove direct dep

Gemfile

@@ -9,7 +9,6 @@ gem "govuk-content-schema-test-helpers"
 gem "mongo"
 gem "mongoid"
 gem "plek"
-gem "puma"
 gem "rack-cache"
 gem "uuidtools"
 gem "whenever", require: false

Gemfile.lock

@@ -433,7 +433,6 @@ DEPENDENCIES
   pact
   plek
   pry-byebug
-  puma
   rack-cache
   rails (= 6.1.4.1)
   rspec-rails

config/puma.rb

@@ -1,40 +1,2 @@
-# Puma can serve each request in a thread from an internal thread pool.
-# The `threads` method setting takes two numbers: a minimum and maximum.
-# Any libraries that use thread pools should be configured to match
-# the maximum value specified for Puma. Default is set to 5 threads for minimum
-# and maximum; this matches the default thread size of Active Record.
-#
-max_threads_count = ENV.fetch("RAILS_MAX_THREADS", 5)
-min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count }
-threads min_threads_count, max_threads_count
-
-# Specifies the `worker_timeout` threshold that Puma will use to wait before
-# terminating a worker in development environments.
-#
-worker_timeout 3600 if ENV.fetch("RAILS_ENV", "development") == "development"
-
-# Specifies the `port` that Puma will listen on to receive requests; default is 3000.
-#
-port ENV.fetch("PORT", 3000)
-
-# Specifies the `environment` that Puma will run in.
-#
-environment ENV.fetch("RAILS_ENV") { "development" }
-
-# Specifies the number of `workers` to boot in clustered mode.
-# Workers are forked web server processes. If using threads and workers together
-# the concurrency of the application would be max `threads` * `workers`.
-# Workers do not work on JRuby or Windows (both of which do not support
-# processes).
-#
-# workers ENV.fetch("WEB_CONCURRENCY") { 2 }
-
-# Use the `preload_app!` method when specifying a `workers` number.
-# This directive tells Puma to first boot the application and load code
-# before forking the application. This takes advantage of Copy On Write
-# process behavior so workers use less memory.
-#
-# preload_app!
-
-# Allow puma to be restarted by `rails restart` command.
-plugin :tmp_restart
+require "govuk_app_config/govuk_puma"
+GovukPuma.configure(self)